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Al掺杂对Li(AlyCo1-y)O2材料结构的影响
引用本文:郝万君,陈岗,史延慧.Al掺杂对Li(AlyCo1-y)O2材料结构的影响[J].高等学校化学学报,2001,22(2):175-178.
作者姓名:郝万君  陈岗  史延慧
作者单位:吉林大学材料科学系,
基金项目:国家自然科学基金,19774028,
摘    要:报道了在800 ℃烧结制备的新型锂二次电池正极材料Li(AlyCo1-y)O2 (y=0, 0.1~1)的X射线衍射结果和由此而揭示的结构演化过程. 研究表明, y≤0.5时,材料呈单相, 0.6≤y≤0.9时,材料呈两相[Li(AlyCo1-y)O2, γ-LiAlO2]共存状态, y=1时,材料又呈单相,为γ-LiAlO2相. Li(AlyCo1-y)O2材料中y值的上限即Al的最大固溶度在0.5左右. 在单相区(y≤0.5),随着Al掺杂的增多, Li(AlyCo1-y)O2材料晶格结构参数发生变化, a轴缩短, c轴变长, c/a比基本呈线性增加,材料的层状属性更加明显.

关 键 词:锂电池正极材料  XRD  结构  Li(AlyCo1-y)O2
文章编号:0251-0790(2001)02-0175-04
修稿时间:2000年2月29日

The Influence of Al Doping on the Structure of Li(AlyCo1-y)O2 Materials
HAO Wan-Jun,CHEN Gang,SHI Yan-hui.The Influence of Al Doping on the Structure of Li(AlyCo1-y)O2 Materials[J].Chemical Research In Chinese Universities,2001,22(2):175-178.
Authors:HAO Wan-Jun  CHEN Gang  SHI Yan-hui
Abstract:X-ray diffraction for Li(AlyCo1-y)O2 was carried out for different values of y(y=0, 0.1—1). The structural evolution of the material with y was revealed. It is shown that material is in single layered phase for y≤0.5; in double phases [Li(AlyCo1-y)O2 and γ-LiAlO2] for 0.6≤y≤0.9 and single [γ-LiAlO2] phase for y=1. The highest solubility for the Al doping is about 50%. Lattice constant a decreases, and lattice constant c increases, respectively, within the region of Al doping for y≤0.5.
Keywords:Cathode materials for lithium batteries  XRD  Structure  Li(Al    y  Co    1-  y    )O  2  
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